Improvement in quartz-crushers



UNITED STATES PATENT Ormea I. S. CROLL, OF NORTH' SAN JUAN, ASSIGNOR TOHIMSELF AND QHARTUS RICE, OF NEVADA, CALIFORNIA.

IMPROVEMENT IN QUARTZ-CRUSHERS.

Specification forming part of Letters Patent No. 58,539, dated October2, 1866.

To all whom it may concern:

Be it known that I, Isaac SHELBY GRoLL, of North San Juan, county ofNevada, State of California, have invented certain new and usefulImprovements in Grinders and Amalgamators for reducing ores containingthe precious metals; and I do hereby declare the following descriptionand accompanying drawings are suftieient to enable any person skilled inthe art or science to which it most nearly appertains to make and use mysaid invention or improvements without further invention or experiment.

The nature of my .invention consists in aseries of rotating mullers forreducing ores, re Volving around a common axis upon a ilat surface, eachmuller revolving on its own axis.

Referring to the drawings, which represent a sectional elevation cutthrough 'the center of the pan, A A is an upright shaft, with partremoved at J J, passing up through the center of a cone, C, in thecenter of the pan i. The pan t' is constructed of iron or othermaterial, of suitable size, with a hollow cone, C. extending up from itscenter. A horizontal stationary wheel, D, with teeth, is iixed rigidlyto this cone about midway above the bottom of the pan, resting in asleeve. Upon the top of the cone I place a plate, a, confined to thetimbers of a frame, b b, revolving with it, by bolts passing throughitand the circular ring or plate c and the timbers. Below this circularringl is another ring, e, of the same dimensions as c', both restingagainst shoulders on the muller spindles or shafts ffj', and are heldiirmly together by bolts and nuts, said bolts passing through them andstandards j" f, the whole forming a stout circular frame.

The circular lnullers or shoes H H H are four in number, more or less,or such a number as the sizeof the pan will admit of, of smooth orcorrugated surface, and are attached to the base of the spindles fj' bypins hh.. About midway upon these spindles I place spur-wheels G G G,which gear into the wheel D.

Motion is imparted by the pulley M, com- Y inunicating with the beveledgears L L, which carries the frame around, causing the mullers to rotatearound the cone or common center of the pan and on their own axes by thespurs G Gr and stationary gear-wheel D in the valley or roadway on thebottom of said pan, imparting to them a compound or double motion,thereby performing a much greater percentage of grinding andamalgamating with much less power than other machines now in use for thesame purpose as where the mullers are connected directly to a commonrotating central axis. Also, in operating my machine the pulp is thrownto the center around the cone instead of being carried by force or powerin a current around the whole interior of the pan, as in other machines,which must neces* sarily require more or less power to accomplish.

I claim- Giving the mullers a positive motion on their own axes by meansof the gears D and Gr Gr, or their equivalents, while said mullers aredriven around in the pan by the rotation of the frame which carries theshafts of the mullers.

Y I. S. GROLL. [1.. s]

Witnesses:

C. W. M. SMITH, Jos. MosHEIMER.

